Jammers have begun to prevail in various countries

Japan allows cell phone jammers to be installed in public entertainment venues such as theaters and concert halls, but only if they have a government-issued permit. Last week, the French Minister of Industry approved a decision to allow installations in cinemas, concert halls and theaters-as long as regulations are in place so that emergency calls can still be made.

Canada has considered allowing a blockade under similar circumstances. But Industry Canada, which regulates Canadian Telecom, decided not to do so, saying the devices could be linked to law enforcement agencies and security.

Netline officials sold the first jammer in 1998, and officials at the company said they sold thousands of gps jammer each year and expanded their business globally, a frightening number.

They are far from the manufacturer. These devices are sold worldwide and many vendors sell them over the Internet.

They are far from the manufacturer. These devices are sold worldwide and many vendors sell them over the Internet.

In Scotland, Ronnie McGuire, owner of the electrical and electronic engineering services company, imported cellphone blockers from Taiwan and sold them to hotels, restaurants, and bars until a local newspaper reported their activities . It is illegal in the UK.

McGuire said he will still import Taiwan equipment, but only sell it to authorized countries.

Loreen Haim, Netline’s director of marketing and sales, will not disclose how many devices the company sells each year or which country buys the most.

Haim said that in Mexico, the main customers are banks seeking to prevent potential thieves from contacting their associates, and the Mexican government plans to use them in prisons.